#include <string>
#include <iostream>
using namespace std;
string A[] = { "3", "7", "31", "127", "8191", "131071", "524287", "2147483647", "2305843009213693951", "618970019642690137449562111", "162259276829213363391578010288127" };
int main() {
	int N;
	cin >> N;
	cout << A[N] << endl;
	return 0;
}